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Questions
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Answer |
Explanations |
1 The gold foil experiment led to the conclusion that each
atom in the foil was composed mostly of empty space because most alpha
particles directed at the foil
(1) passed through the foil
(2) remained trapped in the foil
(3) were deflected by the nuclei in gold atoms
(4) were deflected by the electrons in gold atoms |
1 |
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2 Which subatomic particles are located in the nucleus of
a carbon atom?
(1) protons, only
(2) neutrons, only
(3) protons and neutrons
(4) protons and electrons |
3 |
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3 Which part of a helium atom is positively charged?
(1) electron (3) nucleus
(2) neutron (4) orbital |
3 |
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4 The mass of a proton is approximately equal to the mass
of
(1) an alpha particle (3) a neutron
(2) an electron
(4) a positron |
3 |
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5 At STP, solid carbon can exist as diamond and graphite.
Compared to the molecular structure and chemical properties of diamond,
graphite has
(1) a different molecular structure and different properties
(2) a different molecular structure and the same properties
(3) the same molecular structure and different properties
(4) the same molecular structure and the same properties |
1 |
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6 Which Group 14 element is classified as a metal?
(1) carbon (3) silicon
(2) germanium (4) tin |
4 |
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7 The light emitted from a flame is produced when
electrons in an excited state
(1) absorb energy as they move to lower energy states
(2) absorb energy as they move to higher energy states
(3) release energy as they move to lower energy states
(4) release energy as they move to higher energy states |
3 |
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8 An atom of which element has the greatest attraction for
electrons in a chemical bond?
(1) As (3) Ge
(2) Ga (4) Se |
4 |
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9 Which formula represents a polar molecule?
(1) H2 (3) CO2
(2) H2O (4) CCl4 |
2 |
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10 Two categories of compounds are
(1) covalent and molecular
(2) covalent and metallic
(3) ionic and molecular
(4) ionic and metallic |
3 |
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